JPH1164863A - Liquid crystal display panel and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of the structure of a liquid crystal display panel by subjecting the flanks of a pair of glass substrates to surface roughening to a rugged form and applying a resin so as to cover these parts, thereby increasing the contact areas of a sealing material and the glass substrates. SOLUTION: The flanks of the divided glass substrates 1 are set on a grinding wheel of a grinding machine and the substrates are moved in the state of maintaining the contact with the grinding wheel. Further, the flanks of the glass substrates are subjected to surface roughening and are provided with grooves. The grooves are thus formed on the flanks of the glass substrates 1, 2 and the UV sealing material 3 is formed over the entire part of the flanks. The glass substrates 1, 2 are subjected to surface roughening and are formed with the grooves in such a manner and, therefore, the region where the contact of the UV sealing material 3 is possible is made larger in surface about twice as compared to the case the flanks are flat like with the conventional glass substrates. The contact areas of the sealing material 3 and the glass substrates 1 are, therefore, increased and since the adhesive power of the sealing material 3 is improved, the strength of the liquid crystal display panel is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel and a method of manufacturing the same, and more particularly, to a sealing structure and a sealing method.

[0002]

2. Description of the Related Art In a liquid crystal display panel, after a sealing material is printed on a peripheral portion of a glass substrate on which electrodes are formed, two glass substrates are laminated with a spacer interposed therebetween, and then heated to form an empty cell container. Formed and filled with liquid crystal in this container. Conventionally, formation of a seal pattern is performed by printing a predetermined seal pattern 9 on a glass substrate 1 for a plurality of liquid crystal display panels as shown in a plan view of FIG.
General printing methods include a screen printing method and a dispenser method. FIG. 5B is a cross-sectional view of the liquid crystal display panel. The seal material 10 is generally mixed with an in-seal spacer 11. In both methods, in order to form a seal pattern with desired dimensions, it is necessary to precisely control the amount of the seal material and the content of the spacer in the seal during printing. The curing of the sealing material is performed by ultraviolet light or heat.

In such a conventional method of forming a seal pattern, an area for applying a sealing material becomes narrower as the frame of the liquid crystal display panel becomes narrower. Therefore, it is necessary to make the seal width thinner. For this reason, the contact area between the sealing material and the glass substrate decreases, and the adhesive force between the sealing material and the glass substrate interface decreases.

[0004] An alternative method is disclosed in Japanese Patent Laid-Open No. 5-272.
In 47, the UV sealing material 3 is formed on the side surface of the liquid crystal display panel as shown in FIG. FIG. 6A is a perspective view, and FIG. 6B is a BB ′ cross-sectional view. In the figure, a liquid crystal layer 15 is sandwiched between glass substrates 1 and 2, and a UV sealing material 3 is formed on a side surface of a liquid crystal display panel in which polarizing plates 13 and 14 are attached to the glass substrates 1 and 2, respectively.

In Japanese Patent Application Laid-Open No. 7-287239, FIG.
As shown in the figure, the glass substrate 2 coated with the gap material 12
After the glass substrate 1 is positioned at a position, the work is pressed by the upper pressing table 18 and a load 17 is applied to make a gap. In this state, while applying the UV sealing material 3 from the needle 20, the curing treatment is performed by irradiating the ultraviolet light 7.

[0006]

Problems to be Solved by the Invention Japanese Patent Application Laid-Open No. 5-27247
In Japanese Patent Application Laid-Open No. H11-157, the sealing force is applied to the outer peripheral portion of the liquid crystal display panel to improve the adhesive strength. However, with the increase in the size of the liquid crystal display panel, a reduction in the weight of the liquid crystal display panel is required. For this reason, in the manufacture of liquid crystal display panels, thinning of the glass substrate has become an essential technology, and the thickness of the glass substrate has shifted from 1.1 mm to 0.7 mm at present. Further, it is considered to shift to 0.5 mm as a future technical problem. Thereby, the contact area between the glass substrate and the sealing material is 1.1.
It is reduced to about 60% as compared with a glass substrate having a thickness of mm. As a result, a reduction in the contact area between the sealing material and the glass substrate causes a reduction in the adhesive strength of the sealing material. JP-A-5-27
In No. 247, a sealing material is provided on the side surface for the above-described reason, but it is difficult to estimate that an increase in the adhesive force will be achieved.

[0007] Also in Japanese Patent Application Laid-Open No. 7-287239, it is difficult to increase the adhesive force by a synergistic effect of lowering the adhesive force of the sealing material and lowering the adhesive force by using the UV sealing material. is there.

[0008] An object of the present invention is to address the above-mentioned problems by providing irregularities on the side surface of the glass substrate to roughen the surface and increasing the contact area between the sealing material and the glass substrate.
The object is to improve the reliability of the structure of the liquid crystal display panel.
Another object of the present invention is to provide a method for manufacturing a liquid crystal display panel with improved reliability.

[0009]

According to the present invention, there is provided a liquid crystal display panel in which a pair of glass substrates are bonded together using a resin or the like and a liquid crystal is filled between the two substrates. The surface of the liquid crystal display panel is characterized in that the side surface is roughened in an uneven shape, and a resin is applied so as to cover the portion.

According to the present invention, in applying the ultraviolet curable resin to the liquid crystal display panel, a pair of glass substrates are sandwiched while applying a load to a rotatable pressing jig, and the glass jig is pressed by the pressing jig. By rotating a pair of glass substrates,
An ultraviolet curable resin is applied to the side surface of the glass substrate by using a dispenser, and the liquid crystal display panel is manufactured by irradiating ultraviolet rays following the dispenser to cure the ultraviolet curable resin.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a method for roughening the side surface of a glass substrate used in the present invention will be described. FIG. 1 is a diagram showing a case where a large glass substrate is divided and the side surfaces of the glass substrate are roughened. In FIG. 1A, the side surface of the divided glass substrate 1 is mesh number 1000 (15 μm).
m) is set on a grindstone 21 of a polishing machine having a roughness of FIG.
It is moved in the direction of the arrow in FIG. In this case, the shape of the tooth model of the grindstone 21 of the polishing machine used was a triangular mountain tooth model 21a.

FIG. 1B is a perspective view showing a state in which the side surface of the glass substrate 1 is roughened, in which grooves are provided. With such a structure, the surface area of the side surface of the glass substrate is larger than that in the case of a flat surface, so that the contact area with the sealing material is increased and the adhesive strength is improved.

FIG. 2 is a view showing a liquid crystal display panel according to a first embodiment of the present invention. FIG. 2A is a perspective view after applying an ultraviolet curing resin 3 (hereinafter, referred to as a UV sealing material). , FIG. 2
FIG. 2B is a sectional view taken along line AA ′ of FIG. FIG.
In (b), grooves are formed on the side surfaces of the glass substrates 1 and 2, and the UV seal material 3 is formed on the entire side surfaces. As described above, since the glass substrates 1 and 2 are roughened and the grooves are formed, the area where the UV sealing material 3 can be contacted is smaller than that of the conventional glass substrate in which the side surface is flat. , The surface area is about twice as large. For this reason, the contact area between the sealing material and the glass substrate is increased, and the adhesive strength between the sealing material and the sealing material is improved, so that the strength of the liquid crystal display panel is improved.

FIGS. 3 (a) to 3 (c) are views showing examples of grindstones having different tooth shapes, respectively, and FIGS. 3 (A) to 3 (C).
FIG. 3 is a perspective view of a glass substrate whose side surface is roughened by a grindstone having a different tooth shape shown in FIGS. FIG. 3 (A)
As can be seen from FIGS. 1C to 1C, in these cases, FIG.
Since the surface area of the side surface of the glass substrate is further increased as compared with the case where only one groove is provided, the adhesive force with the UV sealing material is improved.

FIG. 4 is a view showing a method of forming a seal of a liquid crystal display panel according to the present invention. As shown in FIG.
A plurality of the temporarily fixed pair of glass substrates 1 and 2 are set on the pressing jig 5 by the ultraviolet curing resin 8 for the temporary fixing and pressurized. Next, the UV sealing material 3 is applied by a dispenser 4 one by one. Immediately after the UV sealing material 3 is applied to one side, the UV light 7 is irradiated to cure the UV sealing material 3. Next, the pressing jig 5 is rotated by 90 ° about the rotation shaft 22, a UV sealing material is applied, and the sealing material is cured by irradiating ultraviolet light. This operation is performed for four sides to manufacture a liquid crystal display panel. In the present invention, since the pressing jig is used, the final gap of the liquid crystal display panel can be simultaneously performed.

[0016]

As described above, according to the present invention,
By performing the roughening of the side surfaces of the pair of glass substrates, the contact area between the sealing material and the glass substrate increases,
The adhesive strength of the sealing material is improved. As a result, a liquid crystal display panel with improved panel strength can be provided. In addition, in the method of forming a seal for a liquid crystal display panel, by using a pressing jig and a UV sealing material, it is possible to carry out the operation at the same time as the final gap setting, and it is possible to efficiently manufacture the liquid crystal display panel. .

[Brief description of the drawings]

FIG. 1A is a diagram illustrating a method for roughening a glass substrate of the present invention, and FIG. 1B is a perspective view of a glass substrate having a roughened side surface.

FIGS. 2A and 2B are a perspective view and a cross-sectional view taken along line AA ′ of the liquid crystal display panel after applying a UV sealing material.

FIGS. 3A to 3C are views showing examples of the shape of a grindstone used in the present invention, and FIGS. 3A to 3C are perspective views of a glass substrate whose side surfaces are roughened by these grindstones.

FIG. 4 is a diagram illustrating a sealing material applying method of the present invention.

5A is a plan view showing a conventional seal pattern, and FIG. 5B is a cross-sectional view of a conventional panel.

FIG. 6 (a) is a perspective view of another conventional panel.
(B) is BB 'sectional drawing of (a).

FIG. 7 is a cross-sectional view showing still another conventional panel manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass substrate (color filter) 2 Glass substrate (TFT substrate) 3 UV sealing material 4 Dispenser 5 Pressure jig 7 Ultraviolet light 8 UV curing resin for temporary fixing 9 Seal pattern 10 Sealing material 11 Sealing material spacer 12 Gap material 13, DESCRIPTION OF SYMBOLS 14 Polarizer 15 Liquid crystal layer 16 Ultraviolet irradiation device 17 Load 18 Upper press base 19 Lower jig 20 Needle 21 Grindstone 21a Tooth shape 22 Rotation axis

Claims (2)

[Claims] 1. In a liquid crystal display panel in which a pair of glass substrates are bonded together using a resin or the like, the side surfaces of the pair of glass substrates are roughened in an uneven shape so as to cover the portions. A liquid crystal display panel, wherein the resin is applied. 2. A method for manufacturing a liquid crystal display panel in which a pair of glass substrates are bonded to each other, wherein said pair of glass substrates are sandwiched while applying a load to a rotatable pressing jig, and said pair of glass substrates are sandwiched by said pressing jig. A liquid crystal display panel, wherein the glass substrate is rotated, a dispenser is used to apply an ultraviolet curable resin to the side surfaces of the pair of glass substrates, and the dispenser is followed by irradiating ultraviolet light to cure the ultraviolet curable resin. Manufacturing method.